Week 38 and when to use binder

I am now in week 38. Having cramps around pelvic area as it comes and go. Will feel more of it when sitting down but feel fine when standing or walking. Anyone experience it too? Or should i go to hosp if it continues? Also for csect when is best to wear the binder? After csect done for support of movement or a bit later? What is your opinion mummies? Lets share okay? Thank you!